DOC: wrong formatting of the set_option docs

[alimcmaster1]

https://pandas-docs.github.io/pandas-docs-travis/reference/api/pandas.set_option.html

Notes section of the set_option docs seem to have lost some formatting/spacing on master.

PR coming to fix!

Ali

[joshzwiebel]

Is this issue still open? I am new to open source and would like to contribute

[alimcmaster1]

@glemaitre is already looking - but there is many other Good First Issues :)